Simplify Pyenv installation script

Author: szarnyasg

scripts/install-dependencies.sh

@@ -24,7 +24,6 @@ fi
 
 echo "Installing Pyenv"
 git clone https://github.com/pyenv/pyenv.git ~/.pyenv
-echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.bashrc
-echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.bashrc
-. ~/.bashrc
-git clone https://github.com/pyenv/pyenv-virtualenv.git $(pyenv root)/plugins/pyenv-virtualenv
+echo 'export PYENV_ROOT="${HOME}/.pyenv"' >> ~/.bashrc
+echo 'export PATH="${PYENV_ROOT}/bin:${PATH}"' >> ~/.bashrc
+git clone https://github.com/pyenv/pyenv-virtualenv.git ${HOME}/.pyenv/plugins/pyenv-virtualenv